Table 4.

Multiple linear regression model of performance on executive functions tasks by age, education, occupation and income.

Variables		B	SE (B)	β	p	R2
FAS Sum of letters	Age	-0.015	0.020	-0.023	0.436	0.342
	Years' education	0.946	0.079	0.469	<0.001**
	Occupation	0.366	0.329	0.042	0.267
	Income	0.914	0.234	0.131	<0.001**
SVF	Age	-0.057	0.009	-0.181	<0.001**	0.341
	Years' education	0.414	0.037	0.435	<0.001**
	Occupation	0.184	0.156	0.045	0.238
	Income	0.324	0.111	0.099	0.003**
CST	Age	-0.012	0.003	-0.130	<0.001**	0.208
	Years' education	0.081	0.012	0.281	<0.001**
	Occupation	-0.014	0.051	-0.012	0.784
	Income	0.210	0.037	0.212	<0.001**

^**Significant correlation p<0.01. CST: Card Sorting Test; FAS: Phonemic Verbal Fluency Test; SVF: Semantic Verbal Fluency Test.